Minoru KURIHARA, Eiji SUZUKI, Takeshi KATO, Kazuhiko HAYASHI, Kenichi SATO
The power leads for MAGLEV superconducting magnets were made of copper, so that heat leakage through them is not negligible during energization and de-energization. Conventionally a large amount of helium gas is needed for cooling when the power leads carry the current. Also the use of helium gas causes a large disturbance in the on-board refrigerator. Therefore we have developed power leads made of superconductor with high critical temperature composed of Ag-Au alloy sheathed Bi2223 wires for MAGLEV superconducting magnet to decrease this heat leakage, and experimented to examine its properties in various test conditions. This report summarizes the results of the primary and secondary experiments using these power leads.